Answer:
$638,000
Explanation:
The number of shares that should be used in computing diluted earnings per share for the year ended December 31, 2013:
= [(Shares issued at December 31, 2012 × (6 ÷ 12)]
+ [(Shares issued at December 31, 2012 + Additional Shares issued at July 1, 2013) × (6 ÷ 12)]
+ {Purchase common stock × [(Market price - Purchase price) ÷ Market price]}
= [(610,000 × (6 ÷ 12)] + [(610,000 + 40,000) × (6 ÷ 12)] + {32,000 × [($20 - $15) ÷ $20]}
= 305,000 + 325,000 + 8,000
= $638,000